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anion gap The Anion Gap is an approximate measurement of ions, that is molecules with a charge, either negative or positive. Sodium and potassium are positively charged and therefore called cations; this is why they are often represented as Na + and K + respectively.
3.2.2 The Anion Gap can be Misleading. It is determined from a calculation involving 3 other measured ions, so the error with an AG is much higher than that of a single electrolyte determination. The commonest cause of a low anion gap is laboratory error in the electrolyte determinations.